Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cad8002ad4e0b7…

MALICIOUS

PDF

73.7 KB Created: 2021-10-02 13:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 129581b82c560c5033cd71f66d22b9b7 SHA-1: b9ef00afdba0b801da34616e3cc582731d14c3ae SHA-256: f8cad8002ad4e0b77668359d1fc64a1f9ac68aee179c5d08efc83806f9e7e41c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous external URLs were found, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://luxm.pl/userfiles/file/45735498132.pdf In PDF document text
    • http://highendschmiede.de/highendfiles/file/zovawanesuzolavomemi.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/66352558952.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021910132664314.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021092402273673499.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zozagodupuku.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155c330841ac---98265439532.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/bosifubav.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091104484279.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/76257430418.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/19129422468.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/kuturusowusetep.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c3c399003---84390645535.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/nukomosaxawep.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210914114713.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9cd387b8e---85965797217.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/78752921631.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/tixuju.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/fodubijakenozuwuwoso.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/balubikafusurogaditina.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77e2e72b3---pogimeboja.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/76322656712.pdfIn PDF document text
    • http://htwy.com/upload/file/8576236224.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xuwumolizipipo.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/60042554771.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/xujowopixumom.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/23088372154.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/nokejaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=organelles+present+in+eukaryotic+cellsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB64 10880 bytes
SHA-256: 675a062c8ffed9196fad801096fa3e3ffa2fe93fa60354b7e3062fd1753dfaf5
font_01_sfnt_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 17136 bytes
SHA-256: 67b1117e3b4f9feeae4fe8f94e6e44e2dbed300fab9d415e79b72b5cecff0d1a

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